how to include a head file

["??????????" <237825552 () qq com>]

I create a head file in wireshark,name peformance.h:#include <glib.h>


typedef struct peformance_s
{
        gfloat time[100];
        gfloat delay[100];
        guint32 packetSize[100];
        guint32 payload;
        guint32 index;
        guint32 temp_size;
        gfloat temp_time;
}peformance;
extern peformance* peformance_test;



then I add the file to /gtk/main.c file ,
#include "peformance.h" //somebody told me not to use "../peformance.h" because there is subdir to search


peformance pef_test;
peformance *peformance_test=&pef_test;


in the ./wiretap/libpcap.c file, I want to use struct peformance ,
#include "peformance.h"  //or #include "../peformance.h",i do not know which one to use


peformance_test->index=0;


it shows to me one error,the error information is :


"   wiretap/.libs/libwiretap.so: undefined reference to `peformance_test'  "



what is going on and why is that?

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